Methods and systems for borehole telemetry are disclosed. In one embodiment, a borehole telemetry system includes a coiled tubing string that is located in the borehole. A receiver is coupled to the coiled tubing string. In one possible implementation, the receiver is located inside the coiled tubing string. A transmitter is also coupled to the coiled tubing string. The transmitter generates signals guided for at least a portion of their path by the entire internal cross-section of the coiled tubing string to the receiver.
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12. A borehole telemetry system comprising:
a coiled tubing string substantially rotatably fixed in the borehole;
a receiver coupled to the coiled tubing string; and
a transmitter coupled to the coiled tubing string;
wherein the transmitter generates signals guided for at least a portion of their path by a gas-filled section of the coiled tubing string to the receiver.
1. A borehole telemetry system comprising:
a coiled tubing string for use in the borehole;
a receiver coupled to the coiled tubing string; and
a transmitter coupled to the coiled tubing string; wherein the transmitter generates signals guided for at least a portion of their path by the entire internal cross-section of a gas-filled section of the coiled tubing string to the receiver.
23. A method for communicating in a borehole, comprising the steps of:
generating signals at a transmitter coupled to a coiled tubing string in the borehole;
transmitting the signals in the entire internal cross-section of a gas-filled section of the coiled tubing string along at least a portion of their path; and
receiving the signals at a receiver coupled to the coiled tubing string.
2. The borehole telemetry system of
3. The borehole telemetry system of
4. The borehole telemetry system of
5. The borehole telemetry system of
6. The borehole telemetry system of
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21. The borehole telemetry system of
22. The borehole telemetry system of
24. The method of
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29. The method of
30. The method of
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The present invention relates to the field of telemetry systems. In particular, the invention relates to a method and system for well telemetry.
Coiled tubing is used in conventional well operations to convey downhole tools such as perforating guns, bridge plugs, and packers and to fish for objects downhole. Each of these uses can benefit from accurate measurements made by instruments located at the downhole end of the coiled tubing. For example, a measurement of the depth of a downhole device can be provided in real-time by a Coiled Tubing Collar Locator (CTCL). The CTCL includes an electromagnetic casing collar locator to detect the signal disturbance of the magnetic field as the tool passes a casing collar. This is useful information because the depths of the casing collars are known. In order to communicate that event to the uphole portion of the coiled tubing string, the CTCL changes the pressure of a circulation fluid, such as water, by opening and closing a side port by means of a solenoid valve. After a delay that can be calculated, the change in pressure is measurable uphole indicating the depth of the downhole device. Due to the physical characteristics of the circulation fluid, the maximum rate of data that can be communicated by pressure changes is low. It is difficult, therefore, to transmit more complex measurements, for example, formation measurements, uphole. In addition, some wells do not employ circulation fluid, which disables the CTCL-to-surface communication method.
In general, in one aspect, the invention features a system for borehole telemetry. The borehole telemetry system includes a coiled tubing string that is located in the borehole. A receiver is coupled to the coiled tubing string. In one possible implementation, the receiver is located inside the coiled tubing string. A transmitter is also coupled to the coiled tubing string. The transmitter generates signals guided for at least a portion of their path by the entire internal cross-section of the coiled tubing string to the receiver.
In general, in another aspect, the invention features a system for borehole telemetry. The borehole telemetry system includes a coiled tubing string that is substantially rotatably fixed in the borehole. A receiver is coupled to the coiled tubing string. In one possible implementation, the receiver is located inside the coiled tubing string. A transmitter is also coupled to the coiled tubing string. The transmitter generates signals guided for at least a portion of their path by the coiled tubing string to the receiver.
In general, in another aspect, the invention features a method for communicating in a borehole. Signals are generated at a transmitter that is coupled to a coiled tubing string in the borehole. The signals are transmitted for at least a portion of their path across in the entire internal cross-section of the coiled tubing string. The signals are received at a receiver coupled to the coiled tubing string.
The uphole portion 105 of a system for borehole telemetry is illustrated in
In addition to the antenna 120, the receiver 130 can include a low-noise amplifier and a frequency down-converter to prepare the received signal for demodulation. The processor 135 can demodulate the signal provided by the receiver 130. The processor 135 can also filter and phase match the demodulated signal as required. The data represented by the signal can be stored in the electronic storage 140 and it can also be displayed, for example, on a monitor of the rigsite network. Instead or in addition to local display and storage, the data can be remotely transmitted by satellite or telecommunication methods.
In one embodiment the interior of the coiled tubing 110 is filled with air. In another embodiment, a gas such as nitrogen gas 145 is introduced to the coiled tubing string 110 interior. The coiled tubing string 110 can be a welded pipe manufactured in a tube mill from bias welded flat strips of low-alloy, high-strength carbon steel. In one embodiment, a high degree of smoothness on the internal wall of the coiled tubing string 110 assists in the transmission of electromagnetic waves. A different coiled tubing string 110 is composed of a continuous helical metal conductor with a lossy housing made of composite material. The extent to which electromagnetic waves are transmitted in particular modes can be affected by the materials of the coiled tubing string 110. For example, the composite material housing can reduce the portion of the electromagnetic wave energy transmitted in non-TE modes. The modes of transmission are discussed in more detail with respect to the transmitter of
In addition to the carrier frequency, the transmitter 225 also determines the balance of modes in which an electromagnetic wave is launched from the antenna 215. A launched signal will include components from transverse electric (TE) and transverse magnetic (TM) modes. In one embodiment, the transmitter 225 is configured to launch the signal predominately in TE01 or TE11 mode. TE01 mode requires higher carrier frequencies than TE11, but has the advantage of transmitting microwave signals over long distances with low loss. TE11 is the dominant TE mode and can be used with lower transmission frequencies. In one embodiment, the transmitter 225 is configured to launch the signal predominately in TE11 mode initially and in TE01 mode after a particular depth has been reached. In another embodiment, the transmitter mode is determined based on well characteristics before the transmitter 225 is inserted into the borehole.
The foregoing description of the embodiments of the invention has been presented for the purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form disclosed. Many modifications and variations are possible in light of the above teaching. It is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto.
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